JPH0542589A - Molding device of vessel - Google Patents

Abstract

PURPOSE:To manage at low frequency of a change of molds in the case where a kind of a vessel main body is changed, by a method wherein in the title device molding a vessel having a flange part by a female and male molds, the flange part is pressed by a bird's-mouth part for a male mold and female mold for a detachable bird's-mouth mold and round mold. CONSTITUTION:A vessel having a flange part is molded of a sheet material made of plastic by a male mold 11 entering the inside of a cavity of a female mold 12. In this case, pressing parts 19, 21 for the female mold pressing and molding the flange part and a pressing part 17 for the male mold are provided to the female mold 12 and male mold 11. Then the pressing part 17 for the male mold is provided with a bird's-mouth part 17a for the male mold pressing and molding a bird's-mouth of a bird's-mouth type flange part and in the female mold 12, the female mold 12 possessing a bird's-mouth part 19a for the female mold and the female mold 21 for a round mold flange part are made freely detachable. Then the bird's-mouth part 17a for the male mold is inclined toward a female mold 12 side by facing outward and a warp of the flange part is prevented. On the one hand, an uneven surface by blast processing is formed on the pressing part 17 for the female mold and the inside of the bottom part of the cavity of the female mold 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container forming apparatus for thermoforming a container body having a flange portion from a plastic sheet material.

[0002]

2. Description of the Related Art Conventionally, it has been known that a plastic container body is filled with fruit, jelly liquid, etc. and the container body is sealed with a lid member.

Of these, the plastic container body has a container body and a flange portion provided at the upper end opening of the container body, and is made by thermoforming a plastic sheet material. On the other hand, the lid member is heat-sealed to the flange portion of the container body.

[0004]

Generally, a container forming apparatus for forming a container body by thermoforming a plastic sheet material is provided with a female mold having a cavity and a male mold having a plug for entering the cavity. There is. Of these, the container body portion of the container body is formed along the inner surface of the cavity, and the flange portion is formed by being pressed by the female type female pressing portion and the male type male pressing portion.

By the way, some of the container bodies have a round flange portion and others have a crow mouth flange portion.
Conventionally, the male mold and the female mold of the container molding device are changed each time according to each container body. However, it is complicated to change the male type and the female type for each container body each time.

The present invention has been made in view of the above points, and provides a container molding apparatus capable of reducing the frequency of change of the male type or the female type even if the type of the container body changes. With the goal.

[0007]

According to the present invention, there is provided a container having a female mold having a cavity and a male mold having a plug which is inserted into the cavity, for molding a container body having a flange portion from a plastic sheet material. In the molding apparatus, the female die and the male die each have a female die pressing portion and a male die pressing portion that press-mold the flange portion, and the male die pressing portion presses the mouthpiece of the cormorant die flange portion. A container molding device having a cavity for forming a male mold to be molded, wherein the female mold is detachable as a female mold for the corrugated flange part and a female mold for the round flange part, and a cavity In a container molding device comprising a female mold and a male mold having a plug that enters into the cavity, and molding a container body having a flange portion from a plastic sheet material,
The female die and the male die each have a female die pressing portion and a male die pressing portion that press-mold the flange portion. And a female crow mouth portion for pressing the male die crow mouth portion, and the female crow mouth portion and the male die crow mouth portion are inclined outward toward the female die side, respectively. And a female mold having a cavity,
In a container forming apparatus for forming a container main body having a flange portion from a plastic sheet material, the male die having a plug that enters into the cavity, the male die and the female die being a female that press-forms the flange portion. A mold pressing portion and a male pressing portion are respectively provided, and an uneven surface is formed on the surface of the male pressing portion by blasting, and an uneven surface is formed on the inner surface of the cavity bottom of the female mold by blasting. Is a container forming apparatus.

[0008]

According to the invention described in claim 1, the flange portion of the container body can be press-molded between the female pressing portion and the male pressing portion. In this case, the container body having the coroutlet type flange portion is obtained between the male mold having the male corral opening portion and the female mold for the coroutlet type flange portion. Further, a container main body having a round flange portion between the male mold having the male mold mouth portion and the female mold for the round flange portion can be obtained.

According to the second aspect of the present invention, since the female mold mouth portion and the male mold mouth portion are configured to be inclined outwardly toward the female mold side, the flange mouth portion has a bottom portion of the container body. It is possible to obtain a container body that tilts to the side. Therefore, it is possible to prevent the warp upward from being slid.

According to the third aspect of the present invention, since the uneven surface is formed by blasting on the surface of the male die pressing portion and the inner surface of the female cavity bottom portion, the matte surface is formed on the upper surface and the bottom surface of the flange portion of the container body. Can be formed. Therefore, the heat sealing property with the lid member can be improved, and the sliding property of the container body can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 are views showing a first embodiment of a container forming apparatus according to the present invention.

First, referring to FIG. 1, a container main body filled with fruits, jelly liquid and the like and a lid member for sealing the container main body will be described.

As shown in FIG. 1, the container body 2 is filled with the fruit 4 and the jelly liquid 5, and the container body 2 is sealed by the lid member 3.

The container body 2 includes a container body 2a and a container body 2
and a flange portion 2b provided on the periphery of the upper end opening of a. On the other hand, the lid member 3 is the flange portion 2b of the container body 2.
The heat-sealing portion 3b is heat-sealed and the dropping lid portion 3a. Also, the flange portion 2 of the container body 2
On b, an annular protrusion 7 is formed to protrude upward in order to improve heat sealability with the heat seal portion 3b of the lid member 3.

The container body 2 is made of polypropylene (PP) /
Adhesive layer (AD) / Ethylene / vinyl alcohol copolymer (EVOH) / Adhesive layer (AD) / Polypropylene (P
The laminated sheet material of P) is prepared by solid-phase pressure molding performed by heating the laminated sheet material to a temperature not higher than the melting point of polypropylene, for example, 140 to 150 ° C.

On the other hand, the lid member 3 is made of PP / AD / EVO, for example.
It is composed of a gas barrier laminate of H / AD / sealant layer and has flexibility as compared with the container body 2.
The lid member 3 has a sealant layer on the flange portion 2 of the container body 2.
It is designed to be heat-sealed toward the b side.

Next, a container forming apparatus for thermoforming the container body will be described with reference to FIGS. In FIG. 2, the container forming apparatus includes a male mold 11 having a plug 13 and a plug 1
And a female mold 12 having a cavity 14 into which the 3 enters. Of these, the plug 13 is fixed to the lower end of the pressing rod 16 and presses the laminated sheet material 20 into the cavity 14. The pressing rod 16 is driven by a cylinder 22 attached to the frame 15.

By the way, as shown in FIG. 3 and FIG.
The male die 11 and the female die 12 each have a male die pressing portion 17 and a female die pressing portion 19 that press the laminated sheet material 20 to form the flange portion 2b of the container body 2. The male pressing portion 17 and the female pressing portion 19 will be described in detail with reference to FIGS. 5 to 7.

In the present embodiment, the male pressing portion 17 can be adapted to both the container body 2 having the mouthpiece type flange portion and the container body 2 having the round type flange portion. Here, the crow mouth type flange portion has a crow mouth in a part of the flange portion, and FIG. 6 shows a female mold 12 for a container body having the crow mouth type flange portion. Meanwhile, FIG.
A female die 12 for a container body having a round flange portion is shown in FIG.

As shown in FIG. 5, the male die pressing portion 17 has a male die mouth portion 17a for pushing the die opening of the eyelet type flange portion. When making a container body having a crow-mouth type flange portion, the female mold 12 shown in FIG. 6 is used. In FIG. 6, the female die pressing portion 19 of the female die 12 is the male die mouth portion 17
It has a female cormorant opening portion 19a corresponding to a, and presses the corrugated mouth portion of the flange portion between the male mold corrugated opening portion 17a and the female mold corral opening portion 19a.

In FIG. 6, a projection 25 for forming the annular projection 7 on the flange 2b is provided on the female pressing portion 19. The protrusion 25 shown in FIG. 6 corresponds to the crow-mouth type flange portion and has a crow-mouth type protrusion 25a in a part thereof.
have.

On the other hand, when making a container body having a round flange, the male mold 11 is left as it is and the female mold 12 shown in FIG. 7 is used. In FIG. 7, the female pressing portion 21 of the female die 12 has a female receiving portion 21a corresponding to the male die opening 17a. In this case, the female receiving portion 21a is
It functions as a receiving part for the male mold colander 17a,
The portion that is press-molded between the female die receiving portion 21a and the male die mouth portion 17a is cut and removed in a later step. Also, FIG.
As shown in, the flange portion 2b is provided on the female pressing portion 21.
A protrusion 26 for forming the upper annular protrusion 7 is provided.

Next, the operation of the container forming apparatus having the above structure will be described.

First, the plastic sheet material 20 having the above-mentioned layer structure is heated by a heating device (not shown). In order to perform solid-phase pressure molding, the heating temperature is set to a temperature equal to or lower than the melting point of polypropylene, for example, 140 to 150 ° C.

Next, the heated sheet material 20 is transferred to the container forming device.

In this case, the female die 12 of the container forming apparatus is a female die corresponding to the coroutlet type flange portion (FIG. 6).
After that, the female mold 12 rises and approaches the male mold 11,
The sheet material 20 is pressed and held between the male pressing portion 17 of the male mold 11 and the female pressing portion 19 of the female mold 12. In this way, the flange portion 2b of the container body 2 is molded.

Next, the plug 13 descends from the male mold 11 side to press the sheet material 20, and compressed air is supplied to the upper surface of the sheet material 20. At the same time, the sheet material 20 is sucked by an intake port (not shown) formed on the inner surface of the cavity 14 of the female die 12, and the sheet material 20 is closely contacted along the inner surface of the cavity 14 to form the container body 2a.

Subsequently, the sheet material 20 is sent to the cutting step,
The peripheral portion of the flange portion is cut and removed to manufacture the main body 2 having the crow mouth type flange portion.

Next, when the container body 2 having a round flange is manufactured, the female die 12 is replaced with a female die corresponding to the round flange (FIG. 7). Then, the container body 2 having the round flange portion is manufactured by the same operation as described above.

In this case, the portion pressed between the female die mouth portion 21a and the male die mouth portion 17a is cut and removed in the cutting step, so that the container body having a desired round flange portion is formed. Obtainable.

The container body having the round-shaped flange portion thus obtained has substantially the same inner diameter as that of the container body having the crow-mouth type flange portion.

As described above, according to this embodiment,
When the container body having the round flange is formed after the container body having the crow mouth type flange is prepared, the male mold 11 is used.
As it is, only the female die 12 is replaced with the one for the crow-mouth type flange portion to the one for the round type flange portion. Therefore, it is possible to reduce the frequency of exchanging the members of the container molding device and to speed up the work. it can.

Next, the second embodiment of the present invention will be described with reference to FIG.
And FIG. 9 demonstrates.

The second embodiment shown in FIGS. 8 and 9 is different from the first embodiment only in the configuration of the male male pressing portion and the female female pressing portion. It has a substantially similar structure.

That is, as shown in FIG. 8 and FIG.
The female die 12 has a female die pressing portion 19. The female pressing portion 19 is the male pressing portion 1 of the male die 11 as described above.
7 (FIG. 3) and the flange portion 2b of the container body 2 are formed.

Of the female die pressing portion 19, the female die mouth portion 1
9a is inclined outward by about 8 ° downward (toward the female die 12). Similarly, the male die cap 17 of the male die presser 17
Also, a is inclined outwardly to the lower side by about 8 ° similarly to the female die cap portion 19a (the male die inclination state is not shown).

According to the present embodiment, it is possible to press-mold the crow mouth of the flange portion between the male crow mouth portion 17a and the female crow mouth portion 19a. In this case, since the male cormorant opening portion 17a and the female cormorant opening portion 19a are inclined downward toward the outside, it is possible to form a downwardly inclined corral opening.

In general, a hermetically sealed container in which a container body 2 filled with contents is hermetically sealed with a lid member 3 is sealed and then sterilized by boiling. In this case, the flange portion 2b of the container main body 2, especially the crow mouth, tends to bend upward, which is not preferable in appearance.
In the case of the present embodiment, since the container main body 2 having the crow mouth inclined downward can be manufactured, it is possible to reliably prevent upward warpage of the crow mouth after sterilizing the boil.

Next, a third embodiment of the present invention will be described with reference to FIGS.

In the third embodiment, the shape may be round, square, hexagonal or the like. 10 and 11 show an example of a rectangular container.

In the third embodiment shown in FIGS. 10 and 11, the lower surface of the male pressing portion 17 and the inner surface of the bottom of the cavity 14 are blasted to form an uneven surface. This is similar to the first embodiment.

That is, as shown in FIGS. 10 and 11, an uneven surface 28 is formed on the lower surface of the male die pressing portion 17 of the male die 11 by blasting. A protrusion 25 for forming the annular protrusion 7 of the flange 2b is provided on the upper surface of the female pressing portion 19 of the female die 12, and the male pressing portion 17 corresponds to the protrusion 25. A groove 29 is provided. Further, an uneven surface 30 is formed on the inner surface of the bottom of the cavity 14 of the female die 12 by blasting along the peripheral edge thereof.

According to this embodiment, since the concave-convex surface 28 is formed on the lower surface of the male pressing portion 17 for press-molding the flange portion 2b of the container body 2, the matte surface is formed on the upper surface of the flange portion 2b of the container body 2. Can be formed. Therefore, the heat sealing property between the flange portion 2b of the container body 2 and the heat sealing portion 3b of the lid member 3 can be improved. Further, since the concave-convex surface 30 is formed on the inner surface of the bottom of the cavity 14 of the female die 12, a satin surface can be formed on the lower surface of the container body 2, which can increase the slipperiness of the container body 2 Becomes smooth. That is, the smoothness of the combination of the smooth surface and the matte surface of the production line is improved as compared with the combination of the smooth surface and the smooth surface.

[0045]

According to the invention described in claim 1, there is obtained a container body having a cormorant type flange portion between a male mold having a male cormorant opening portion and a female mold for a corrugated mouth type flange portion, A container body having a round flange between a male mold having a male die and a female mold having a round flange is obtained. The outer periphery of the flange portion of the container body thus obtained is cut in a later step. As described above, different types of container bodies can be obtained by the same male mold, and therefore the frequency of exchanging the members of the container forming apparatus with respect to different types of container bodies can be reduced.

According to the second aspect of the present invention, it is possible to obtain a container body in which the mouth of the flange portion is inclined toward the bottom side. Therefore, when the container body is hermetically sealed with the lid member and then sterilized by boiling, it is possible to prevent the warpage of the flange portion, especially above the weed mouth.

According to the third aspect of the present invention, since the landing surface can be formed on the upper surface and the bottom surface of the flange portion of the container body, it is possible to improve the heat-sealing property with the lid member and at the same time, the container. The sliding property of the main body can be increased.

[Brief description of drawings]

FIG. 1 is a side sectional view of a sealed container in which a plastic container body is sealed with a plastic lid material.

FIG. 2 is a side sectional view showing a first embodiment of the container forming apparatus according to the present invention.

FIG. 3 is a bottom view of the male mold of the container molding device shown in FIG.

FIG. 4 is a plan view of a female mold of the container molding device shown in FIG.

5 is an enlarged view of the male type shown in FIG.

FIG. 6 is an enlarged plan view of a female die for the coroutlet type flange portion.

FIG. 7 is an enlarged plan view of a female die for a round flange portion.

FIG. 8 is an enlarged plan view of a female mold showing a second embodiment of the container molding apparatus according to the present invention.

9 is a partial side sectional view of the female die shown in FIG.

FIG. 10 is a side sectional view showing a third embodiment of the container forming apparatus according to the present invention.

11 is a view showing an uneven surface by blasting of the container forming apparatus shown in FIG.

[Explanation of symbols]

 2 Container Main Body 2a Container Body 2b Flange Part 3 Lid Material 11 Male Model 12 Female Model 17 Male Model Pressing Part 17a Male Mold Crow Portion 19 Female Model Pressing Portion 19a Female Crow Portion 20 Sheet Material 21 Female Model Pressing part 21a Female receiving part 28 Uneven surface 30 Uneven surface

Claims (3)

[Claims] 1. A container forming apparatus for forming a container main body having a flange portion from a plastic sheet material, the container forming apparatus comprising a female mold having a cavity and a male mold having a plug that enters into the cavity. The male die has a female die pressing portion and a male die pressing portion for press-molding the flange portion, respectively, and a male die cormorant opening portion for press-molding the cormorant mouth of the cormorant die flange portion is formed on the male die pressing portion. A container forming apparatus, wherein the female mold is detachable from a female mold for a corrugated flange and a female mold for a round flange. 2. A container forming apparatus for forming a container body having a flange portion from a plastic sheet material, which comprises a female mold having a cavity and a male mold having a plug that enters into the cavity. The male die has a female die pressing portion and a male die pressing portion, respectively, which press-mold the flange portion, and the female die pressing portion and the male die pressing portion press the corral opening of the cormorant die flange portion. A container molding characterized in that a mold mouth portion and a male mouth portion are respectively provided, and the female mouth portion and the male mouth portion are inclined outward toward the female die side. apparatus. 3. A container forming apparatus for forming a container body having a flange portion from a plastic sheet material, the container forming apparatus comprising a female mold having a cavity and a male mold having a plug that enters the cavity. The female die has a female die pressing portion and a male die pressing portion that press-mold the flange portion, and an uneven surface is formed by blasting on the surface of the male die pressing portion, and the female die cavity is formed. A container forming device, wherein an uneven surface is formed on the inner surface of the bottom by blasting.